| orogeny | (noun) the process of mountain formation (especially by the upward displacement of the earth's crust) | - |
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| orograph | (noun) A machine for use in making topographical maps. | - |
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| orography | (noun) the science of mountains | Synonyms: orology |
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| oroide | (noun) alloy of copper and tin and zinc; used in imitation gold jewelry | Synonyms: oreide |
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| orology | (noun) the science of mountains | Synonyms: orography |
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| oropharyngeal | (adjective) of or relating to or located near the oropharynx | - |
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| oropharynx | (noun) cavity formed by the pharynx at the back of the mouth | - |
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| orotund | (adjective) (of sounds) full and rich | Synonyms: pear-shaped, rotund, round |
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| (adjective) ostentatiously lofty in style | Synonyms: bombastic, declamatory, large, tumid, turgid |